To all of you still having the 530, here is a simple external crossover mod I did that I posted separately, but I am also posting it here:
The mod can be done externally easily or better internally by opening the back terminal plate and do it inside but without taking all the speaker apart.
We have 0.5mH in series with the woofer terminal, and 2.7 Ohm in series with 22uF and in series with the tweeter terminal.
This image is for illustration of the added parts , as it not included the current installed crossover.
Here are the on axis tweeter height both speakers before and after the mod:
Here is my home made spinorama without the mod that I did few years ago.
I also attach the results from Erin to show how similar my home made spinorama to Erin results.
My Original
Erin Measurements:
And the Modified one I did today.
Some first listening tests are promising comparing to the KEF R3.